PROBLEM SOLVED!
I am using the great Arduino library “ClickButton” to sense the joystick switch closure. ClickButton offers a number of ‘click-counts’ and also returns -1 on a LONG click. So - The requirement will be the stick needs to be pressed about a second or so - seems to work very nicely and short clicks/presses are not seen.
That was a head-scratcher for me - wasn’t sure how I’d get it going. Thanks for getting back to me.
It might be a unique feature to add to GCP to allow some short ‘message’ to be sent back to the controller - a single character or Boolean should offer plenty of capability. Manly for custom cases like mine. 
=A.